I wasn’t either, but one thing I like about Python is that when you need something done, chances are someone has already done it 
Speaking of environment variables, it would be good if you can set a special environment variable before the program launches. Then I can try to set the theme and font to something sensible. I notice in the Korora install that the font is an unaliased serif font that is difficult to read at small sizes. May I suggest the env variable RAPHODO_APPIMAGE ? I don’t know if I can fix the aliasing problem, but hopefully the font family can at least be set to a sans serif font.
pymediainfo + libmediainfo is still not working, for some reason. libmediainfo is detected – I can see the message Libmediainfo library: /tmp/.mount_ILk2aT/usr/lib/libmediainfo.so.0, but there is also the log message ERROR pymediainfo is installed, but the library libmediainfo appears to be missing. The code that runs that check is very simple: pymediainfo.MediaInfo.parse('/dev/null'). If an OSError occurs, the code assumes that libmediainfo is missing.
The gst video frame grabbing is still failing. I’ll figure out a way to ask the python introspection developers what’s up there. it’s pretty strange how it fails so often across different library versions.